Today, at preschool, I got to meet the mother of my daughter's best friend. She complimented mine's grades, and noted her quirkiness. I complimented her's for being congenial and being well-rounded. Later, my daughter said they are no longer besties because her mom said I called her daughter fat. FML

Even if someone were to insult my child, there is no way in hell I would tell my child the insult. Why would the mom even do that? Oh wait, I know the answer. Because she is stupid enough to mistaken well-rounded for fat. Goodness.

Being half Filipino myself, i can agree with this. Though my mother is very understanding of the english language, other members of our family I am usually stuck with explaining the meaning of words when they get butthurt. Btw, Filipinos do love to gossip. Everytime my mom was involved with drama we'd always hear the story, how the other person is a traitor and how we are no longer allowed to be friends with said "traitor" or their family xD

Even if someone were to insult my child, there is no way in hell I would tell my child the insult. Why would the mom even do that? Oh wait, I know the answer. Because she is stupid enough to mistaken well-rounded for fat. Goodness.

I acknowledge that it may also mean physically round, but conversationally we do not speak that way (at least I have never heard it that way unless it was a joke). And usually you can tell if something was meant to be an insult from the tone. Since OP intended to compliment the daughter, I am sure the tone was not negative.
However my main point was what I first touched on. The mother still should not have said this to the daughter. That bothered me most.

What a selfish mother making her child and yours suffer for her ignorance! I hope she whinges to someone about this story and she gets rightly corrected in her mistake. Would love to see the look on her face then!